Java实现文件（图片）上传

以你之姓@ 2021-10-19 20:30 474阅读 0赞

**前端代码**

<body>
    	<h1>实现文件上传</h1>
    	
    	<form action="http://localhost:8091/file" method="post" 
    	enctype="multipart/form-data">
    		<input name="file" type="file" />
    		<input type="submit" value="上传"/>
    	</form>
    </body>

**后端代码**

@Controller
    public class FileController {
    	
    	/**
    	 * @param file
    	 * @return
    	 * @throws IOException 
    	 * @throws IllegalStateException 
    	 */
    	@RequestMapping("/file")
    	@ResponseBody
    	public String file(MultipartFile file) throws IllegalStateException, IOException {
    
    		//获取文件名称
    		String fileName = fileImage.getOriginalFilename();
    		
            //校验图片类型
    		if(!fileName.matches("^.+\\.(jpg|png|gif|JPG|PNG|GIF)$")) {
    			return "0";
    		}
    
    		//判断是否为恶意程序
    		try {
    			BufferedImage bufferedImage = 
    				ImageIO.read(file.getInputStream());
    			int width = bufferedImage.getWidth();
    			int height = bufferedImage.getHeight();
    			if(width==0 || height ==0) {
    				return "0";
    			}
    			
    			//准备文件夹
    			String dateDir = 
    					new SimpleDateFormat("yyyy/MM/dd")
    					.format(new Date());
    			
    			String localDir = localDirPath + dateDir;
    			File dirFile = new File(localDir);
    			if(!dirFile.exists()) {
    				//如果文件不存在,则创建文件夹
    				dirFile.mkdirs();
    			}
    
    			//使用UUID定义文件名称
    			String uuid = 
    			UUID.randomUUID().toString().replace("-","");
    			//图片类型
    			String fileType = 
    			fileName.substring(fileName.lastIndexOf("."));
    			
    			//拼接新的文件名称
    			String realLocalPath = localDir+"/"+uuid+fileType;
    			
    			//完成文件上传
    			uploadFile.transferTo(new File(realLocalPath));
    		    //todo 可把图片信息存入数据库
                 
    		} catch (Exception e) {
    			e.printStackTrace();
    			return "0";
    		}
    		return "1";
    	}
    }